I did a huge amount of research on the internet over more than a year before making my decision. I sent Tony at McCruise probably 25 long, detailed emails over the course of several months before making my decision. Keep in mind, I hadn't bought anything from him, yet, and he had no guarantee that I ever would. But damned if he didn't take the time to write thoughtful, detailed replies to each and every one of my emails. I bought and installed the McCruise in December.
Frankly, it seems to me the only thing that is the same between the Murph's unit and the McCruise is the vacuum actuator... and the similarities end there.
Oh, yeah... they both also have control pads, but those aren't similar at all.
I have drunk the McCruise Kool-Aid, and it is good. For me, the pre- and post-sales support, the CIU, the computer/software, the multiple safety interlocks, the weather-sealed-motorcycle-specific control pad, and just the overall motorcycle-specific design of the McCruise made it worth the money to me. That equation may not balance for everyone. Just be sure you are willing to go forward with absolutely ZERO mfg support before buying the Murph's.
Many people here have installed the Audiovox/Murph's unit and ridden with it for thousands of trouble-free miles, and I'm not going to ridicule their decisions. They bought and installed what worked for them and most of them are likely much more mechanically-inclined than I. But I just can't imagine choosing it over the McCruise unless you just can't afford the McCruise.